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Non Purchased Loans - Summary of Non-purchased Loans and Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 9,086,256 | $ 7,623,663
Unearned income | (3,127) | (3,341)
Loans, net of unearned income | 9,083,129 | 7,620,322
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 1,295,912 | 1,039,393
Loans, net of unearned income | 1,295,912 | 1,039,393
Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 64,992 | 57,354
Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 740,668 | 633,389
Loans, net of unearned income | 740,668 | 633,389
Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,795,343 | 2,343,721
Loans, net of unearned income | 2,795,343 | 2,343,721
Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 4,051,509 | 3,427,530
Loans, net of unearned income | 4,051,509 | 3,427,530
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 137,832 | 122,276
Loans, net of unearned income | 199,697 | 176,289
Non-Purchased |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 6,392,839 | 5,591,897
Unearned income | (3,127) | (3,341)
Loans, net of unearned income | 6,389,712 | 5,588,556
Non-Purchased | Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 875,649 | 763,823
Non-Purchased | Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 64,992 | 57,354
Non-Purchased | Real estate – construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 635,519 | 547,658
Non-Purchased | Real estate – 1-4 family mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,087,890 | 1,729,534
Non-Purchased | Real estate – commercial mortgage |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,628,365 | 2,390,076
Non-Purchased | Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 100,424 | $ 103,452

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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84165051&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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